December in Harlow averages a daily high of 7.7°C with nights around 2°C. Expect roughly 16.3 wet days totalling 67.6mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Harlow is June–September.
Based on ROTHAMSTED, UK (17.3km), 1995–2024. 30 years of December data.